image upside down (including axis labels etc) using App designer: same code OK outside GUI

Using image(app.UIAxes,C) in draw() callback. ComponentBrowser/Axes/Rulers/YDir setting makes no difference. Changing YDir after image() line changes the displayed image, but leaves the axes upside down. No idea what [x,y]=ginput(1) is giving back - not what I wanted anyway.

[Walter Roberson]

I wonder if somehow you have two axes in the same place?

DId you possibly use yyaxis ? Or did you possibly create an axes as part of the app design, but also call axes() inside your code, and so doing create a second axes?

[Stuart MacGregor]

No, just called : app.data.classname.function(app.UIAxes) in the draw() callback, and the class method calls image(ax,C), where ax is the passed axes object.

The text of the axes ruler numbers is drawn upside down! I could not do that if I tried.

Answer 1

[Stuart MacGregor]

shut down matlab and opened it again, and it all works!

Some internal matlab state bug.

[Image Analyst]

Similar things have been observed before:

https://www.mathworks.com/matlabcentral/answers/?term=tag%3A%22upside+down%22

[Stuart MacGregor]

Happened again: seems can be caused by exiting a GUI using the window close x button (on Ubuntu) rather than by the Done button on the GUI display.